COCCASTER BULBIFERUS. 



11 



mouth-angle plates can be clearly distinguished as somewhat large triangular 

 plates, but it is not easy to see whether there was a torus. 



Post-mortem alterations have caused the adambulacralia to fall away and 

 expose the ambulacralia. Each of these possesses a strong ridge. The depressions 

 for the radial water-vascular vessel and the ventral cross-muscles are only slight. 

 The plates appear to me to touch throughout their entire length, and not to leave 

 spaces for the passage of ampullae. 



Side View. — The supero- and infero-marginalia are seen to alternate distinctly 

 in side view. 



Ornament. — Text-fig. 33 (p. 6ij) shows an enlarged view of the ornament of an 

 infero-marginal. There are a number of very slender spines which are carried on 

 small tubercles occupying a distinct ridge on the face of the ossicle. It may be 

 that spine-bearing tubercles are common amongst Paleozoic Starfishes, and that 

 the exceptionally fine mudstones in which these specimens were embedded have 

 afforded special opportunities for the recognition of the true character of the 

 ornament. I also think that I can detect spines on the supero-marginalia, but it is 

 difficult to make quite certain on the point. 



Table op the Species op the Hudsonasterid^. 





Formation. 



R. 



r. 



Remarks. 



Hudsonaster matutinus. Hall 

 H. narrawayi, Hudson . 



jET. milleri, Schuchert 



H. incomptus. Meek 

 H. ruffosus, Billings 



H. hatheri Schuchert 



GirvanastiT sculpUis, n. sp. . 

 Belaster ordovicus, n. sp. 

 Coccaster bidbiferus, n. sp 



iM. Ordovician 

 M. Ordovician 



.M. Ordovician 



U. Ordovician 

 U. Ordovician 



U. Ordovician 

 (Ashgillian) 



U. Ordovician 

 (Ashgillian) 



U. OrdoviciHE 

 (Ashgillian) 



Silurian 

 (L. Ludlow) 1 



14 mm. 



12 mm. 



(about) 

 coverino 

 Its true 

 ductory 

 referene 

 with Pa 

 excellen 

 the gem 

 are larg( 

 H-shapt 

 that " it 

 which c 

 clear th 

 The goo 

 from St. 

 much sn 

 different 



35 mm. 



4 mm. 



' plates" u 

 orientatioi 

 Section t 

 es) I stated 

 Iseaster cara 

 t illiistiatic 

 IS "Hudsoru 

 i and solid, 

 d as in othf 

 may be sho 

 ise Frotopal 

 at the syst 

 d specimen 

 Paul, Mini 

 laller than 

 proportion 



" Intermediate in strvicture between the 

 older H. narrawayi and the younger H. 

 incomptus" (Schuchert 85, p. 58). 



This was originally described by Hudson 



as "A fossil Starfish with ambiilacral 



Qder the name of Protopalxaster narrawayi. 



1 was shown by Eaymond. In the Intro- 



this Monograph (p. 21, for which see 



that I considered the species to be identical 

 ctaci, Gregory, and gave copies of Hudson's 

 )ns. Schuchert (p. 59) jslaces the species in 

 ister," but states that the ambulacral plates 

 rectangular, with slightly rounded ends, not 

 ■r species of the genus. He gives his opinion 

 wn that this character is of generic value, in 

 asaHer will have to be revived." It is very 

 ematic position of the form is not settled. 

 s only show the oral sides. The specimens 

 lesota, placed by Schuchert in the species are 



he holotype described by Hudson, and have 

 3 of the major and minor radius. 



A well known species. Madreporite apical. 

 The holotype of the genus. 



The specimens from which the species was 

 described belong really to Tetraster wy- 

 ville thomsoni (Bather, 92). 



See p. 70. 



See p. 73. 



See p. 75. 



12 mm. 

 (abovit) 

 11 mm. 

 22 mm. 

 (abovit) 



7 mm. 

 IG'5 mm. 

 (5 5 mm. 



3 mm. 



6 mm. 



85 mm. 



2o mm. 

 45 mm. 

 3-2 mm. 



